Solving Systems of Linear Equations Symbolically

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1 " Solving Systems of Linear Equations Symolically Every day of the year, thousands of airline flights crisscross the United States to connect large and small cities. Each flight follows a plan filed with air traffic control efore take-off. The flight paths of airplanes are not straight lines from take-off to landing. But parts of those paths are generally straight-line segments. At any hour of the day, the pattern of flight plans might look like the diagram elow. y AA 29 0S 314 FA 12 SB 5 WC 19 x The diagram seems to show many potential mid-air collisions. Why do you think such disasters almost never occur? What information aout flight paths is not shown on the diagram? If planned flight paths are represented y equations, an air-traffic control system can calculate intersection points and warn of possile collisions. The equations for the flights in the diagram are shown in the tale. In this prolem, you will explore a simplified air-traffic control system. You will ignore the height aove the ground and time and consider only whether the flight paths of two planes intersect. These intersection points tell you which parts of the flight paths controllers need to examine more carefully to prevent collisions. 52 The Shapes of Algera

2 4.1 The y mx ± Case The equations for the flight paths can e used to calculate the nine intersection points shown on the graph. Getting Ready for Prolem 4.1 A tale of equations for the flight paths is at the right. To find the intersection of WC 19 and AA 29, you need to find the (x, y) pair that satisfies the system of linear equations elow. (The racket is a special notation used to indicate a system of equations.) y 5 0.3x 2 2 y 5 1.5x Jeff writes the following to solve this system. 0.3x 2 = 1.5x x = 1.6 x = x = 4 3 Airline/Flight Flight Paths Apex Airlines Flight AA 29 We-Care Air Flight WC 19 Open Sky Airlines Flight OS 314 Fly Away Airlines Flight FA 12 Sky Bus Airlines Flight SB 5 Equation y 1.5x 0.4 y 0.3x 2 y 0.3x 5 y 0.4x 9.5 y 2x 14 Explain Jeff s reasoning. What does x = tell you? How can you find the y-coordinate of the intersection point? Prolem 4.1 The y mx ± Case A. Write and solve systems to find the intersections of these flight plans. 1. WC 19 and SB 5 2. SB 5 and AA SB 5 and FA FA 12 and AA 29 B. Study the work you did in Question A. Descrie a strategy for solving any system of this form shown elow. y 5 ax 1 y 5 cx 1 d C. What could an air-traffic controller do if two flight plans intersect? Investigation 4 Solving Systems of Linear Equations 53

3 4.2 The ax ± y c Case When a system of linear equations is in y = mx + form, it is easy to write a single linear equation with the same solution as the system. y 5 ax 1 ecomes ax + = cx + d. y 5 cx 1 d The equations in a linear system are not always given in y = mx + form. In this prolem, you ll consider systems of this form: ax 1 y 5 c dx 1 ey 5 f Getting Ready for Prolem 4.2 Suppose the solution to a situation requires you to find values of x and y that satisfy the system: 3x 2 y 5 30 x 1 y 5 14 One useful strategy for solving a linear system is to rewrite the equations in familiar equivalent forms. Write each equation in y = mx + form. Then, find a solution using the method you learned in Prolem 4.1. Write each equation in x = ky + c form. Then, find a solution. Are the solutions the same? Why might you expect oth methods to give the same solution? Prolem 4.2 Solving Systems y Writing Equivalent Forms A. Decide whether it is easier to write each equation in equivalent y = mx + form or equivalent x = ky + c form. Then, write each equation in the form you chose. 1. x + y = 3 2. x - y = x + y =-1 4. x - 2y = x + 6y = x + 4y = In parts (1) (6), how did you decide which form to use? 54 The Shapes of Algera

4 B. Solve each system y writing the equations in y = mx + or x = ky + c form and then using the strategy from Prolem x 1 y x 2 y 525 x 1 6y x 2 y 525 2x 1 4y x 1 2y 5 10 C. Look ack over your work from Question B. 1. What do you notice aout the systems that makes this method a good one to use? 2. Descrie the steps needed in using this method to solve a system. D. 1. What does it mean for two equations to e equivalent? 2. What does it mean to solve a linear system? 3x 2 y 5 30 x 1 y Solving Systems y Sustitution Writing the equations in a linear system in y = mx + or x = ky + c form is not always easy. Sometimes the arithmetic ecomes messy. For example, consider how you would solve this system. 3x 2 y 5 5 2x 1 5y 528 Solve oth equations for y to get y = mx + form. 3x - y = 5 2x + 5y =-8 -y = 5-3x 5y =-8-2x 8 2 y = 3x - 5 y =- - x 5 5 Set the right sides of the equations equal x - 5 =- - x x - 25 =-8-2x 17x = 17 x = 1 In this prolem, you ll look at another solution method that is easier in many cases. Investigation 4 Solving Systems of Linear Equations 55

5 Getting Ready for Prolem 4.3 Check the reasoning in this method of solving a system of linear equations y sustitution and see if you can explain why it works. 1. The system 3x 2 y 5 5 is equivalent to the system y 5 3x 2 5 2x 1 5y 528 2x 1 5y From that fact, any solution should satisfy 2x + 5(3x - 5) =-8. Why is this equation an advantage over the two-equation system? 3. Solving this single equation for x, you get: 2x + 15x - 25 =-8 17x = 17 x = 1 4. Then y = 3(1) - 5 = The ordered pair (1, -2) satisfies oth equations in the original system: 3(1) - (-2) = 5 2(1) + 5(-2) =-8 So (1, -2) is the solution. Does this strategy produce the only solution for oth equations in the original system? Why? Which solution strategy do you think is easier for this system, writing the equations in y = ax + form and setting them equal or using sustitution? Why? Prolem 4.3 Solving Systems y Sustitution A. Use sustitution to solve each system. 2x 1 y 521 4x 1 2y x 2 2y x 2 7y 5 1 x 2 y 525 2x 1 4y x 1 2y x 1 y x 1 y x 1 2y x 2 4y 5220 x 2 y 5 2 B. You may have een puzzled y the solution to two of the systems in Question A. Complete parts (1) and (2) for each of these two systems. 1. Graph the two lines to see if you can make sense of the situation. 2. Write oth equations in y = mx + form to see if this helps you understand the results. 56 The Shapes of Algera

6 C. 1. Decide whether writing in equivalent form or sustituting would e easier for solving the system. Then, solve the system. a. 4x 1 y x 1 y x 1 y x 1 7y For each system, explain why you chose the solution method. 4.4 Solving Systems y Comination You have already developed some useful strategies for solving a simple linear equation like 3x + 5 = 10. You know that you can add or sutract the same quantity on oth sides and preserve equality. The same is true for multiplication or division. These ideas, called the Properties of Equality, can help you develop another method for solving linear equations. This method involves comining separate linear equations into one equation with only one variale. Getting Ready for Prolem 4.4 These steps show the comination method for solving x 2 y 5 4 x 1 y 5 5. If x - y = 4 and x + y = 5, then (x - y) + (x + y) = (1) 2x = 9 (2) x = 4.5 (3) x + y = 5 (4) y = 5 (5) y = 0.5 (6) Give reasons for steps 1 5. Why is adding the two original equations an advantage? Would sutracting the two original equations work just as well? Investigation 4 Solving Systems of Linear Equations 57

7 Prolem 4.4 Solving Systems y Comination A. Use the comination method to solve these linear systems. 2x 1 4y 5 3 2x 1 3y 5 4 2x 2 3y x 1 2y 5 5 5x 1 3y 528 5x 2 3y 5 7 B. 1. Explain why System B is equivalent to System A. System A 3x 1 2y x 2 y 5 6 System B 3x 1 2y x 2 2y Rewriting System A as System B is a possile first step in solving the system y the comination method. Complete this solution process y comining the two equations in System B. C. 1. Add the two equations in System A. Graph oth equations in System A and the new equation you made y adding. What do the three equations have in common? 2. Graph System B and the new equation you made y adding. What do the three equations have in common? 3. Why does the graph you made with System B and the new equation help to solve the system? D. In parts (1) and (2), write an equivalent system that is easy to solve y comining equations. Then find the solution. Check your work y solving the system with a different method. 2x 1 2y x 2 6y 5 12 E. 1. Decide whether equivalent form, sustitution, or comination would e easiest for solving the system. Then, solve the system. a. 2x 1 y 5 5. x 1 2y 5 5 c. 3x 2 y 5 15 x 2 6y 5 11 d. 2x 1 y 5 5 e. 24x 2 2y For each system in part (1), explain how you decided which solution method to use. F. Two of the systems in Question E did not have single solutions. How could you have predicted this efore you started to solve them? x 1 3y 5 4 3x 1 4y 5 2 x 1 2y 5 5 3x 1 6y x 1 6y 5 7 3x 2 2y The Shapes of Algera

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